Monkey-wrench



0. H. KIRKPATRICK.

MONKEY WRENCH.

APPLICATION FILED 050.16. |919.

1,364,937. v Patented Jan. 11, 1921.

W MII OTEY R.. KIRKPATRICK, OF FORT WORTH, TEXAS.

MONKEY -WRENCI-I.

Specification of Letters Patent. Patented Jan. 11, 1921.

Application filed December 16, 1919. Serial No. 345,309.

To all 'whom t may concer/n Be it known that I, O'rnY R. KIRKPATRICK, acitizen or' the United States, residing at Forth Worth, in the county ofTarrant and State of Texas, have invented certain new and usefulImprovements in Monkey- IVrenches, of which the following is a speci-1'ication.

My invention relates to wrenches` and more particularly to monkeywrenches; and the object is to provide wrenches which can be instantlyadjusted to any ordinary size nut and which has advantages over existingmonkey wrenches and which is provided with an improved adjustmentwhereby the wrench can be adjusted for different sizes of nuts by thesame hand which is using the wrench and which is simple in constructionand which can be easily and quickly adj usted to any required grasp andwhich may also be used as a pipe wrench. Other objects and advantageswill be fully explained in the following description and the inventionwill be more particularly pointed out in the claim.

Figure 1 is a side elevation of the wrench. Fig. 2 is an edge view ofthe same. Fig. 3 is. a longitudinal section of the movable jaw and abroken section of the handle or power arm and showing how the movablejaw is locked stationary for use. Fig. 1 is an elevation of the work endof the locking plunger. Fig. 5 is a side elevation of the wrench withthe movable jaw provided with a shoe. Fig. 6 is an edge view of thesame.

imilar characters of reference are used to indicate the same partsthroughout the several views..

This invention includes a handle or power arm 1 having a stationary jaw2 integral therewith. The wrench is also provided with a movable jaw 3which has two yokes 4; and 5 which receive and move on the power arm 1.The yokes have openings to receive the arm 1 and the yokes arepreferably integral with the jaw 3. A portiono'f the power arm 1 isprovided with' teeth and means are provided for locking the jaw 3 to thepower arm 1. The jaw 3 has formed integral therewith a lock-carryingmember 7 which has a chamber therein-for a plunger lock 8 which hasteeth corresponding to the teeth on the power arm. A spring 9 holds thelock 8 in engagement with the power arm. The teeth on the power arm haveone l shoulder or side of each tooth at right angles to the power armand the lock 8 has teeth which have `one shoulder or side at rightangles tothe lock 8 so that the lock may be released from the power armby a, pull at right angles to the power arm and another object in thisconstruction is that the teeth of the lock will go directly into theteeth of the power arm. This will prevent the jaw 3 from receding fromthe obj ect to be. grasped. The lock 8 is actuated for releasing by apivoted lever 10 which is fulcrumed in a chamber 11 in the lock-carryingmember 7. The lever 10 engages the lock 8 loosely by reason of the notchor recess in the side of the plunger lock. The fulcrum pin 12 isinserted through the walls of the lock-carrying member.

The advantage of the construction shown herein is that the lock 8 does.not rest on a pivot pin during the strain, as in other wrenches. Thelock bears against a solid bearing wall 13 of the lock-carrying member 7when the jaw 3 is under strain and the flat surfaces of the teeth of thelock bear against the flat surfaces of the teeth 6 of the power arm. Atthe same time the spring 9 is holding the teeth in engagement. The 'flatbearing wall 13 coperates with the lock 8 to sustain the entire strainagainst the movable jaw 3.

The variation shown in Figs. 5 and 6 includes a jaw 14 and a shoe 15mounted thereon. In this form of the device, the shoe may be made of adifferent metal from the power arm 1.

The movable jaw 3 has increased strength because it has thelock-carrying member 7 integral therewith, thus. making a long bearingand the yoke` 5 tends to keep the grip surface at right angles to thehandle 1. The lock 8 cannot be displaced because of the four walls ofthecavity or chamber which retains the lock.

What I claim, is,-

A wrench of the type described, comprising a shank, a fixed outer jawcarried thereby, rack teeth formed upon the inner edge of said shank, amovable inner jaw and frame having a longitudinal opening therethroughand slidably mounted onsaid shank, said frame having a recess thereinrectangular in cross-section and extending at right-angles to thelongitudinal aXis of the shank, and from said longitudinal opening intosaid frame and one wall of said recess constituting a bearing wall, aratchet block rectangulai 1n cross-Section slidable in said recess andgulded hy the Walls thereof With the teeth of the block maintained 1nposition to engage the shank teeth for coperating with said bearing Wallto sustain the sti'ain on said movable Jaw, said block having a sidenotch7 a spring Within said recess the handle of the Wrench, and a leverpivoted Within said opening and extending into the side notch of theratchet block and normally standing idle and adapted to shift said blockfrom engagement With the toothed shank and against tension of thespring, and provided with a handle in line With the handle of theWrench.

In testimony whereof, I set my hand, this fifth day of December, 1919.

OTEY R. KIRKPATRICK.

